LXR linux/drivers/ide/ide

   1/*
   2 * Platform IDE driver
   3 *
   4 * Copyright (C) 2007 MontaVista Software
   5 *
   6 * Maintainer: Kumar Gala <galak@kernel.crashing.org>
   7 *
   8 * This program is free software; you can redistribute  it and/or modify it
   9 * under  the terms of  the GNU General  Public License as published by the
  10 * Free Software Foundation;  either version 2 of the  License, or (at your
  11 * option) any later version.
  12 */
  13
  14#include <linux/types.h>
  15#include <linux/init.h>
  16#include <linux/kernel.h>
  17#include <linux/ide.h>
  18#include <linux/ioport.h>
  19#include <linux/module.h>
  20#include <linux/ata_platform.h>
  21#include <linux/platform_device.h>
  22#include <linux/io.h>
  23
  24static void __devinit plat_ide_setup_ports(struct ide_hw *hw,
  25                                           void __iomem *base,
  26                                           void __iomem *ctrl,
  27                                           struct pata_platform_info *pdata,
  28                                           int irq)
  29{
  30        unsigned long port = (unsigned long)base;
  31        int i;
  32
  33        hw->io_ports.data_addr = port;
  34
  35        port += (1 << pdata->ioport_shift);
  36        for (i = 1; i <= 7;
  37             i++, port += (1 << pdata->ioport_shift))
  38                hw->io_ports_array[i] = port;
  39
  40        hw->io_ports.ctl_addr = (unsigned long)ctrl;
  41
  42        hw->irq = irq;
  43}
  44
  45static const struct ide_port_info platform_ide_port_info = {
  46        .host_flags             = IDE_HFLAG_NO_DMA,
  47        .chipset                = ide_generic,
  48};
  49
  50static int __devinit plat_ide_probe(struct platform_device *pdev)
  51{
  52        struct resource *res_base, *res_alt, *res_irq;
  53        void __iomem *base, *alt_base;
  54        struct pata_platform_info *pdata;
  55        struct ide_host *host;
  56        int ret = 0, mmio = 0;
  57        struct ide_hw hw, *hws[] = { &hw };
  58        struct ide_port_info d = platform_ide_port_info;
  59
  60        pdata = pdev->dev.platform_data;
  61
  62        /* get a pointer to the register memory */
  63        res_base = platform_get_resource(pdev, IORESOURCE_IO, 0);
  64        res_alt = platform_get_resource(pdev, IORESOURCE_IO, 1);
  65
  66        if (!res_base || !res_alt) {
  67                res_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  68                res_alt = platform_get_resource(pdev, IORESOURCE_MEM, 1);
  69                if (!res_base || !res_alt) {
  70                        ret = -ENOMEM;
  71                        goto out;
  72                }
  73                mmio = 1;
  74        }
  75
  76        res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  77        if (!res_irq) {
  78                ret = -EINVAL;
  79                goto out;
  80        }
  81
  82        if (mmio) {
  83                base = devm_ioremap(&pdev->dev,
  84                        res_base->start, res_base->end - res_base->start + 1);
  85                alt_base = devm_ioremap(&pdev->dev,
  86                        res_alt->start, res_alt->end - res_alt->start + 1);
  87        } else {
  88                base = devm_ioport_map(&pdev->dev,
  89                        res_base->start, res_base->end - res_base->start + 1);
  90                alt_base = devm_ioport_map(&pdev->dev,
  91                        res_alt->start, res_alt->end - res_alt->start + 1);
  92        }
  93
  94        memset(&hw, 0, sizeof(hw));
  95        plat_ide_setup_ports(&hw, base, alt_base, pdata, res_irq->start);
  96        hw.dev = &pdev->dev;
  97
  98        if (mmio)
  99                d.host_flags |= IDE_HFLAG_MMIO;
 100
 101        ret = ide_host_add(&d, hws, 1, &host);
 102        if (ret)
 103                goto out;
 104
 105        platform_set_drvdata(pdev, host);
 106
 107        return 0;
 108
 109out:
 110        return ret;
 111}
 112
 113static int __devexit plat_ide_remove(struct platform_device *pdev)
 114{
 115        struct ide_host *host = dev_get_drvdata(&pdev->dev);
 116
 117        ide_host_remove(host);
 118
 119        return 0;
 120}
 121
 122static struct platform_driver platform_ide_driver = {
 123        .driver = {
 124                .name = "pata_platform",
 125                .owner = THIS_MODULE,
 126        },
 127        .probe = plat_ide_probe,
 128        .remove = __devexit_p(plat_ide_remove),
 129};
 130
 131static int __init platform_ide_init(void)
 132{
 133        return platform_driver_register(&platform_ide_driver);
 134}
 135
 136static void __exit platform_ide_exit(void)
 137{
 138        platform_driver_unregister(&platform_ide_driver);
 139}
 140
 141MODULE_DESCRIPTION("Platform IDE driver");
 142MODULE_LICENSE("GPL");
 143MODULE_ALIAS("platform:pata_platform");
 144
 145module_init(platform_ide_init);
 146module_exit(platform_ide_exit);
 147